Weather in Florianopolis in September 2025
Average weather
Average temperature in Florianopolis in September
The expected average maximum temperature in September is +77°F with a maximum of +90°F and a minimum of +55°F.
The average maximum temperature goes down 16% by the end of the month, compared with the beginning of the month, from +75°F to +70°F.
Is Florianopolis warm or cold in September?
Florianopolis is typically mild in September.
Maximum temperatures go up compared to the previous month from +72°F to +72°F. The minimum temperature also goes up from +59°F to +61°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Florianopolis:
Climate in Florianopolis in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +72°F | +72°F | +75°F | ||||
| Min. temperature | ||||||
| +41°F | +45°F | +54°F | ||||
| Max. temperature | ||||||
| +91°F | +95°F | +95°F | ||||
| Rainfall | ||||||
| 92 mm | 128 mm | 129 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 83% | 82% | 82% | ||||
| Air pressure | ||||||
| 1019 HPa | 1017 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 6 | 3 | 2 | ||||
| Cloudy days | ||||||
| 11 | 9 | 8 | ||||
| Rainy days | ||||||
| 13 | 16 | 19 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. The temperature levels stay the same in the area of +72°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 92 mm to 128 mm. It feels drier, as humidity decreases from 83% to 82%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 6 sunny days in August to 3 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Florianopolis is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Florianopolis?
Climate Change Over the Years
The climate in Florianopolis in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1983 (+76°F) and the highest in 2019 (+79°F). The driest year was 1988 with only 947 mm of rainfall, and the wettest year was 2022 with 2773 mm.
FAQ
Is September a good time to visit Florianopolis?
Can you sunbathe in Florianopolis in September?
Is Florianopolis rainy in September?
Is it sunny in Florianopolis in September?
Other cities in Brazil
Monthly weather in Florianopolis
Source of the data
For this page, we’ve looked at the typical weather in Florianopolis, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.